I am trying that both these functions execute together or not at all. If one func fails then the other shouldn't execute either.
func SomeFunc() error { //Write to DB1 if err1 != nil { return err } } func OtherFunc() error { //Write to DB2 if err2 != nil { return err } } I am trying to write to two different databases and the writes should either happen in both or neither.
I tried having like if err1 == nil then execute Otherfunc() but then Otherfunc() can fail.
Then we can rollback changes like if err2!= nil then Update db1 back to what it was before. Problem with this is that this Update operation may fail too.
I see this as a slippery slope. I want that these operations to happen together or not at all.
Thanks for any help.
EDIT:
I found this question and the "eventual consistency" makes sense to me.
This is my implementation now:
func SomeFunc() error { //Write to DB1 if err1 != nil { return err } } func OtherFunc() error { //Write to DB2 if err2 != nil { return err2 } } func RevertSomeFunc() { //Revert back changes by SomeFunc fmt.Println("operation failed.") if err3 != nil { time.Sleep(time.Second * 5) //retry every 5 sec RevertSomeFunc() } } func main() { err1 := SomeFunc() if err1 != nil { fmt.Println("operation failed.") return } err2 := OtherFunc() if err2 != nil { go RevertSomeFunc() // launch it off to a go-routine so that it doesnt block the code. } } If there is some improvement I can make to this implementation. Please lmk.
